<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var s = "i love javascript very much"
        var arr = s.split(' ')
        arr.forEach((_, i) => arr[i] = arr[i][0].toUpperCase() + arr[i].slice(1))
        console.log(arr.join(' '))
    </script>
</body>
</html>